1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2001-2003 Sistina Software (UK) Limited.
15 #include <linux/device-mapper.h>
17 #define DM_MSG_PREFIX "linear"
20  * Linear: maps a linear range of a device.
28  * Construct a linear mapping: <dev_path> <offset>
38 		ti->error = "Invalid argument count";  in linear_ctr()
39 		return -EINVAL;  in linear_ctr()
44 		ti->error = "Cannot allocate linear context";  in linear_ctr()
45 		return -ENOMEM;  in linear_ctr()
48 	ret = -EINVAL;  in linear_ctr()
50 		ti->error = "Invalid device sector";  in linear_ctr()
53 	lc->start = tmp;  in linear_ctr()
55 	ret = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &lc->dev);  in linear_ctr()
57 		ti->error = "Device lookup failed";  in linear_ctr()
61 	ti->num_flush_bios = 1;  in linear_ctr()
62 	ti->num_discard_bios = 1;  in linear_ctr()
63 	ti->num_secure_erase_bios = 1;  in linear_ctr()
64 	ti->num_write_zeroes_bios = 1;  in linear_ctr()
65 	ti->flush_bypasses_map = true;  in linear_ctr()
66 	ti->private = lc;  in linear_ctr()
76 	struct linear_c *lc = ti->private;  in linear_dtr()
78 	dm_put_device(ti, lc->dev);  in linear_dtr()
84 	struct linear_c *lc = ti->private;  in linear_map_sector()
86 	return lc->start + dm_target_offset(ti, bi_sector);  in linear_map_sector()
91 	struct linear_c *lc = ti->private;  in linear_map()
93 	bio_set_dev(bio, lc->dev->bdev);  in linear_map()
94 	bio->bi_iter.bi_sector = linear_map_sector(ti, bio->bi_iter.bi_sector);  in linear_map()
102 	struct linear_c *lc = ti->private;  in linear_status()
111 		DMEMIT("%s %llu", lc->dev->name, (unsigned long long)lc->start);  in linear_status()
115 		DMEMIT_TARGET_NAME_VERSION(ti->type);  in linear_status()
116 		DMEMIT(",device_name=%s,start=%llu;", lc->dev->name,  in linear_status()
117 		       (unsigned long long)lc->start);  in linear_status()
124 	struct linear_c *lc = ti->private;  in linear_prepare_ioctl()
125 	struct dm_dev *dev = lc->dev;  in linear_prepare_ioctl()
127 	*bdev = dev->bdev;  in linear_prepare_ioctl()
132 	if (lc->start || ti->len != bdev_nr_sectors(dev->bdev))  in linear_prepare_ioctl()
141 	struct linear_c *lc = ti->private;  in linear_report_zones()
143 	return dm_report_zones(lc->dev->bdev, lc->start,  in linear_report_zones()
144 			       linear_map_sector(ti, args->next_sector),  in linear_report_zones()
154 	struct linear_c *lc = ti->private;  in linear_iterate_devices()
156 	return fn(ti, lc->dev, lc->start, ti->len, data);  in linear_iterate_devices()
162 	struct linear_c *lc = ti->private;  in linear_dax_pgoff()
165 	*pgoff = (get_start_sect(lc->dev->bdev) + sector) >> PAGE_SECTORS_SHIFT;  in linear_dax_pgoff()
166 	return lc->dev->dax_dev;  in linear_dax_pgoff()
170 		long nr_pages, enum dax_access_mode mode, void **kaddr,  in linear_dax_direct_access()  argument
175 	return dax_direct_access(dax_dev, pgoff, nr_pages, mode, kaddr, pfn);  in linear_dax_direct_access()
201 	.name   = "linear",